Polarimetry with ALFOSC

NEW! Since April 2012 the Calcite mounting is back to default orientation, i.e.
the two components are split horizontally on the CCD. The intermediate solution of rotating the
Calcite to reduce overheads was at work from Nov 2008 until Apr 2012. With the new controller there
is no need to produce horizontal spectra to save readout time. See the
polarimetry instrument setup page for details.